Copana et al. (2026) More Frequent, Faster, and Seasonally Reorganized Drought‐to‐Pluvial Transitions in U.S. Cities

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Earth s Future
• Year: 2026
• Date: 2026-10-30
• Authors: J. Copana, Farshid Vahedifard, Amir AghaKouchak
• DOI: 10.1029/2026ef009237

Research Groups

Not explicitly stated in the abstract.

Short Summary

This study develops a probabilistic framework to quantify the evolving likelihood, rapidness, and seasonal timing of drought-to-pluvial transitions under future warming. It reveals a systematic reorganization of these hydroclimatic dynamics, indicating that future drought recovery may increasingly occur through faster, more frequent, and seasonally altered transitions to wet conditions.

Objective

• To quantify the evolving likelihood, rapidness (Relief Time), and seasonal timing of drought-to-pluvial transitions under projected hydroclimatic variability due to continued warming.

Study Configuration

• Spatial Scale: 27 U.S. cities representing all nine National Oceanic and Atmospheric Administration Climate Regions.
• Temporal Scale: Historical period and future climate projections.

Methodology and Data

• Models used: Probabilistic framework integrating: severity-resolved Markov formulation, Event Coincidence Analysis, Circular statistics.
• Data sources: Standardized Precipitation Evapotranspiration Index (SPEI) derived from a 20-member ensemble of downscaled climate-model projections.

Main Results

• For severe drought thresholds, drought-to-pluvial transitions are projected to increase by approximately 132%–154% relative to historical conditions.
• Severe drought states are projected to increase by 128%–203% relative to historical conditions.
• Across most cities, Relief Time (interval between drought amelioration and subsequent pluvial onset) shortens by 0.1–0.3 months, indicating increasingly abrupt transitions.
• The seasonal timing of the first post-drought pluvial event shifts by approximately 1–3 months in many regions.
• Joint changes in transition probability and Relief Time reveal distinct regional acceleration regimes characterized by increasing transition frequency, increasing abruptness, or both.

Contributions

• Development of a novel probabilistic framework for estimating conditional drought-to-pluvial transition probabilities, quantifying Relief Time, and characterizing seasonal timing.
• Quantification of the systematic reorganization of drought-to-pluvial dynamics under future warming, including changes in frequency, abruptness, and seasonality.
• Provision of transferable metrics for diagnosing drought-to-pluvial behavior and offering actionable insights for flood-risk assessment, water-resource management, and climate adaptation.

Funding

Not specified in the abstract.

Citation

@article{Copana2026More,
  author = {Copana, J. and Vahedifard, Farshid and AghaKouchak, Amir},
  title = {More Frequent, Faster, and Seasonally Reorganized Drought‐to‐Pluvial Transitions in U.S. Cities},
  journal = {Earth s Future},
  year = {2026},
  doi = {10.1029/2026ef009237},
  url = {https://doi.org/10.1029/2026ef009237}
}